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Search: id:A028576
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A028576 1/(4n) * sum over d|n of {mu(n/d) * (2d choose d)^2}. +0
2
1, 4, 33, 304, 3175, 35556, 420665, 5176000, 65664000, 853367900, 11309870605, 152342891952, 2080240006923 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A041024 A123780 A054371 this_sequence A093185 A075132 A113170

Adjacent sequences: A028573 A028574 A028575 this_sequence A028577 A028578 A028579

KEYWORD

nonn

AUTHOR

Lionel Levine (levine(AT)ultranet.com)

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Last modified September 5 17:15 EDT 2008. Contains 143476 sequences.

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